Akasison Siphonic Roof Drainage

The Akasison siphonic system provides architects and hydraulic engineers maximum freedom when designing rainwater drainage. Siphonics design principles can be used on all building types where large volumes of water are to be removed efficiently and cost-effectively.

Akasison requires far fewer downpipes than traditional gravity systems. Specially designed roof outlets, located in gutters, or membrane system roof/deck areas are connected to a common collector pipe located at a high level within the building. The collector pipe is installed horizontally, without gradient and is typical of smaller pipe diameter. When operating siphonically, the pipe network flows full, without air and with a higher velocity than traditional gravity systems, so pipes can be smaller.

The horizontal collector pipe is routed to a convenient point in the building, such as a services riser. It then connects to a downpipe which is the engine room of the system. A full bore plug of water accelerates as it falls under gravity through the downpipe, creating a vacuum action that is used to efficiently and rapidly suck rainwater from the roof.

In a traditional drainage system, rainwater on a roof surface flows to the lowest point under gravity. A roof outlet at the gutter low point enables rainwater to connect via a downpipe to the underground drainage system. Both water and air are drawn in and travel through the downpipe in a spiral motion. The capacity of the roof outlet determines how much water can enter the downpipe.

Akasison siphonic outlets are designed to streamline rainwater flow. As rainstorm increases in intensity, the outlets become submerged, preventing air from entering the system. Small diameter pipes beneath the outlets prime quickly and generate plugs of water that flow to the downpipe. Water falling vertically through a downpipe accelerates under gravity and creates negative pressure behind it. The vacuum generated and eventual 100% filling of the pipework, translates back through the system and siphons or sucks the water off the roof.

The Akasison siphonic roof drainage system offers many advantages compared to conventional drainage for all building types:

Siphonic roof drainage has advantages in material price, required labour on site and optimises the space in the building.

Akasison is more than a collection of components. We combine specific siphonic outlets, dedicated bracketing and the trusted Akatherm HDPE pipe system together with a professional siphonic design service, local product availability and a complete project support service by Vinidex.
On www.vinidex.com.au technical support documentation is available as well as the complete Akasison product range as a REVIT content package to include in the BIM project model.

Akasison is a highly circular solution, using fewer pipes that are smaller in diameter than a conventional gravity drainage solution, using components that are up to 90% re-usable at the end of the project life.

A great deal of knowledge is involved in every step of our design and development process, right through to completion. Knowledge of fluid dynamics, legislation and regulations, the application of standards and our own procedures. But especially about how things work in practice. We offer training and support so that we can continue to lead the way in the market with our Akasison system. Everything has to be in good order on the roof.